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- Rivers 257
- Bodies of water 216
- Explorers 191
- West (U.S.) 176
- River engineering 154
- Northwest, Pacific 152
- Discovery and exploration 151
- Photography 132
- Canada, Western 106
- United States--Appropriations and expenditures 75
- River surveys 50
- Railroad engineering 47
- Inland navigation 40
- Rapids 37
- Canals--Design and construction--Costs 34
- Transportation 32
- Dams--Design and construction 29
- Boats and boating 25
- Water resources development 25
- Discoveries in geography 24